Remove CorrelationInstanceMetadata
Remove unused Service Locator
Refactor IConfiguration.Metadata from ICollection<IMetadata> to IDictionary<string, object>. ICollection<IMetadata> is still used to build IDictionary, but now Configuration is consistent in that each property represents the *useable* type. (IE, no transformation needed to consume.)

GetMetadata & SaveMetadata are no longer part of IPersistenceStore